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New Zealand Railways class N
The class N was introduced in a time when more and more American locomotives were built for the NZR, as the American designs were generally lighter and more flexible than the British ones. The N was a 2-6-2 that was i...
| New Zealand Railways class NRemove | |
|---|---|
| Variant | 1885 variant |
| Built | 1885, 1891 |
| Manufacturers | Baldwin |
| Wheel arrangement | 1C1 |
| Gauge | 1067 mm |
| Length | 15291 mm |
| Service mass | 29669 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | New Zealand Railways class N1885 variant |
|---|---|
| Built | 1885, 1891 |
| Manufacturers | Baldwin |
| Wheel arrangement | 2-6-2 (Prairie) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | New Zealand Railways class N1885 variant |
|---|---|
| Length | 15.29 m |
| Wheelbase | 7.06 m |
| Total wheelbase | 12.90 m |
| Service mass | 29.7 t |
| Adhesion mass | 22.9 t |
| Total mass | 45.9 t |
| Rigid wheelbase | 2.90 m |
| Axle load | 7.9 t |
| Water capacity | 22,731 l |
| Fuel capacity | 7.6 t (coal) |
Boiler
| Property | New Zealand Railways class N1885 variant |
|---|---|
| Grate area | 1.486 m² |
| Firebox surface | 8.129 m² |
| Tube heating surface | 77.15 m² |
| Evaporative heating surface | 84.913 m² |
| Total heating surface | 84.9 m² |
Power plant
| Property | New Zealand Railways class N1885 variant |
|---|---|
| Driver diameter | 1,245 mm |
| Boiler pressure | 9.3 bar |
| Expansion type | simple expansion |
| Cylinders | two, 381 x 508 mm |
Power
| Property | New Zealand Railways class N1885 variant |
|---|---|
| Power source | steam |
| Estimated power | 261 kW (355 PS) |
| Starting effort | 46.9 kN |
Calculated values
| Property | New Zealand Railways class N1885 variant |
|---|---|
| Factor of adhesion | 1 : 4.79 |
| Optimal speed | 34 km/h |
| Power-to-weight ratio | 8.8 kW/t |
| Heating Surface Equivalent | 125.9 m² |
| Cylinder volume/HSE | 1 : 919.87 |
| Adhesive weight/Total | 1 : 1.30 |
| Tractive force/Heating surface | 1 : 11.53 |
| Grate area/Heating surface | 1 : 57.14 |
| Firebox/Tube surface | 1 : 9.49 |
